| 摘要 |
A reconfigurable electromagnetic band gap (EBG) impedance surface comprises a plurality of conductive patches Pal - Pa6 disposed as an array above a ground plane GP with conductive pipes Pi1 Pi6 extending from respective patches. Conductors C1 C6 are arranged to extend into each respective conductive pipe Pi1 Pi6 without any direct connection to the pipe. Load impedances Za1 Za6, Zb1 Zb6 are provided for connection to the conductors C1-C6 such that the load impedance to at least one of the conductors can be independently adjusted in value relative to that of at least one of the other conductors. The values of the impedances are varied electrically, for example by electrically switching between different load impedances using switching circuitry SW1 SW6, and/or by electrically controlling a variable load impedance using varying circuitry. The load impedances may be capacitive and/or inductive and/or resistive, LC resonators, open circuit or short circuit terminations. Circuit board and dielectric materials may be used in the construction of the impedance surface. Some surface elements may be switched to an antenna feed AF3, AF4 and are able to send and/or receive radio frequency signals. |
